Messages

1

General Mach Discussion / Re: Un demanded external e-stop

« on: September 25, 2008, 05:14:15 PM »

Hi

With the limit switches disconnected from the breakout board ie with only the stepper motors connected the problem is still there. This almost certainly eliminates the limit switch lines as being a the cause. The only input line still connected is the e-stop and this has a temporary shorting link to eliminate any issues there.

Martin

2

General Mach Discussion / Un demanded external e-stop

« on: September 25, 2008, 02:11:54 PM »

Hi

As a new member I am hoping someone can throw some light on to what could be causing un-demanded external e-stops on a new CNC setup. I have used a Campbell breakout board and even with all but the step motors disconnected I am getting un-demanded external e-stop triggers when the spindle motor in enabled.

I have found that by increasing the debounce time to 7000 reduces the frequency of the occurrence but does not eliminate it. Looking at the drive test shows that the computer is nice and stable. No trigger lights show prior to the e-stop when watching the diagnostic screen and if the de-bounce is set to normal levels the machine trips out after a couple os seconds run time.

At first I thought it was emf from the spindle cable but this is shielded and earthed so should reduce the chance.

1) Is pin 10 the only pin that can generate an e-stop?
2) Has anyone come across this problem before and if so what was causing it?

Many thanks

Martin